Levytska S. The oligomerization of vinyl monomers on high disperse oxide surfaces

The subject of study: the capability of acid sites of the high disperse oxides surface initiated the oligomerization of vinyl monomers.The goal of the study: investigation of capability of acid sites of the high disperse aluminum- and titanium-containing silicas and anatase initiated the process of polimerization of a series of vinyl monomers and of influence of the modified oxides on the physico-mechanical properties of pillared polypropene. Methods of investigation: IR and UF-Vis reflectance spectroscopy, derivatography, field ionisation mass spectrometry, exclusion-liguid chromatography, chemісal analysis, guantum chemical study. The surface acid sites of the thermoactivated at 670 K Al- and Ti-aerosils, and those of anatase have been shown to be capable to initiate the polymerization of n-butylvinyl ether, styrene, and N-vinylpyrrolidone resulting in oligomer formation with chain length of 9-20 monomer units. Mechanisms have been proposed of the polymerization of these vinyl monomers with participation of the Bronsted acid sites of aluminosilicates and the Lewis acid sites of titania. A patent has been declared to modify thermoactivated oxides over adsorptive oligomerization of vinyl monomers that let it possible to obtain disperse modified samples with content of organic matter of up to 60 wt. %.